<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
'<h1>这是名字全称的结果</h1>'
'<h2>hello {{fullname}}</h2>'

'<h2>aeiou出现的内容有:{{letters_result}}</h2>'
</body>
</html>